Edit 2020-10-09:
Hi,
so you do see issues with Windows 7 fonts.
In this case, that's likely, because Windows 7 is not supported anymore and does not bundle all the latest emojis in it's font.

As said, however, you can also solve your issue by choosing another emoji style that does not use the system emojis. To do that, right-click on the icon of the extension, choose “Manage extension” → “Settings” and choose a different icon set next to “emoji design”.

If this solves your problem it would be glad if you could adjust your voting.

Best regards,
rugk

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Hi,
sorry for causing these inconveniences.
If you do only see black and white emojis, this may be a limitation of your operating system.
By default, this add-on uses the emojis of your system. For old Linux systems e.g., there may be only monochrome icons.
To troubleshoot this issue, we'd need more information about your system (i.e. what OS and what Firefox version do you use?). It would be glad if you could open an issue on https://github.com/rugk/awesome-emoji-picker/issues/ and fill out the details there, so we can fix this problem in the next release.

However, you can also already solve your issue by choosing another emoji style. To do that, right-click on the icon of the extension, choose “Manage extension” → “Settings” and choose a different icon set next to “emoji design”.
By default, this extension uses your system emojis, but there are different styles available and they all look quite great.

If this helped, it would be glad if you could adjust your voting.

Best regards,
rugk